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A model depicting the dual role of OsRac1 in inducing ROS production and down-regulating OsMT2b expression during defense signaling in rice. Recognition of signals from pathogens and elicitors activates OsRac1, which in turn induces NADPH oxidase-mediated ROS production. In parallel to ROS production, the expression of the ROS scavenger OsMT2b gene is down-regulated, thereby potentiating ROS accumulation and defense signaling.
